Isolator circuit
AssigneeTyco Fire & Security GmbH
InventorsFaruk Meah, Andrew D. Naish, Steven Ian Bennett
Life of this patent
Estimating the term…
Abstract
An isolator circuit (25) for a unit of a safety system (10) includes a power control line (14) connectable to a first loop of a safety system and a power connection (16) connectable to a second loop of the safety system. A switch (26) is connected to the power control line (14), and the switch has a closed configuration and an open configuration. A controller (28) controls the configuration of the switch (26). If a voltage across the circuit (10) from the power connection (16) to the power control line (14) falls below a predetermined level, the controller (28) opens the switch (26), thereby causing a disconnection to occur in the first loop.
Claims19
An isolator circuit for a unit of a detection system, the isolator circuit comprising:
- a first power control line and a second power control line;
- a first power connection connected to the first power control line and a second power connection connected to the second power control line;
- a switch in the first power control line, the switch having a closed configuration and an open configuration;
- and
- a controller for operating the switch;
- wherein the controller is arranged to measure a power supply voltage across the circuit from the first and second power control lines, and if the voltage falls below a predetermined level, the controller opens the switch, thereby causing a disconnection to occur in the first power control line, wherein a first input connects the controller to the first power control line at a first point of the first power control line and a second input connects the controller to the first power control line at a second point of the first power control line, the first point and the second point of the first power control line are positioned on opposing sides of the switch with respect to each other, and the controller is configured to receive power via both the first input and the second input regardless of the switch being open.
A unit for a safety system, comprising an isolator circuit, the isolator circuit comprising:
- a first power control line and a second power control line;
- a first power connection connected to the first power control line and a second power connection connected to the second power control line;
- a switch in the first power control line, the switch having a closed configuration and an open configuration;
- and
- a controller for operating the switch;
- wherein the controller is arranged to measure a power supply voltage across the circuit from the first and second power control lines, and if the voltage falls below a predetermined level, the controller opens the switch, thereby causing a disconnection to occur in the first power control line, wherein a first input connects the controller to the first power control line at a first point of the first power control line and a second input connects the controller to the first power control line at a second point of the first power control line, the first point and the second point of the first power control line are positioned on opposing sides of the switch with respect to each other, and the controller is configured to receive power via both the first input and the second input regardless of the switch being open.
A detection system comprising an isolator circuit, the isolator circuit comprising:
- a first power control line and a second power control line;
- a first power connection connected to the first power control line and a second power connection connected to the second power control line;
- a switch in the power control line, the switch having a closed configuration and an open configuration;
- and
- a controller for operating the switch;
- and
- a remote control device arranged to communicate with the circuit;
- wherein the controller is arranged to measure a power supply voltage across the circuit from the first and second power control lines, and if the voltage falls below a predetermined level, the controller opens the switch, thereby causing a disconnection to occur in the first power control line, wherein a first input connects the controller to the first power control line at a first point of the first power control line and a second input connects the controller to the first power control line at a second point of the first power control line, the first point and the second point of the first power control line are positioned on opposing sides of the switch with respect to each other, and the controller is configured to receive power via both the first input and the second input regardless of the switch being open.
Dependencies are inferred from the claim text.